⬆️ Upgrade backend testing dependencies.

Author: aofleejay

medium/package.json

@@ -8,17 +8,17 @@
   },
   "license": "MIT",
   "dependencies": {
-    "express": "4.17.1"
+    "express": "^4.17.1"
   },
   "devDependencies": {
-    "@babel/core": "7.5.0",
-    "@babel/node": "7.5.0",
-    "@babel/preset-env": "7.5.0",
-    "@babel/register": "7.4.4",
-    "chai": "4.2.0",
-    "mocha": "6.1.4",
-    "nodemon": "1.19.1",
-    "sinon": "7.3.2",
-    "supertest": "4.0.2"
+    "@babel/core": "^7.5.5",
+    "@babel/node": "^7.5.5",
+    "@babel/preset-env": "^7.5.5",
+    "@babel/register": "^7.5.5",
+    "chai": "^4.2.0",
+    "mocha": "^6.2.0",
+    "nodemon": "^1.19.2",
+    "sinon": "^7.4.2",
+    "supertest": "^4.0.2"
   }
 }